From: Rick Farrington <ricardo.farrington@cavium.com>
Date: Tue, 18 Jul 2017 00:51:10 +0000 (-0700)
Subject: liquidio: lowmem: do not dereference null ptr
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=689062a18c00f49f9c32ac8d5366c075ab691c30;p=linux.git

liquidio: lowmem: do not dereference null ptr

Don't dereference a NULL ptr in octeon_droq_destroy_ring_buffers().

Signed-off-by: Rick Farrington <ricardo.farrington@cavium.com>
Signed-off-by: Satanand Burla <satananda.burla@cavium.com>
Signed-off-by: Raghu Vatsavayi <raghu.vatsavayi@cavium.com>
Signed-off-by: Felix Manlunas <felix.manlunas@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/cavium/liquidio/octeon_droq.c b/drivers/net/ethernet/cavium/liquidio/octeon_droq.c
index 645668339620c..f7b5d68eb4cf2 100644
--- a/drivers/net/ethernet/cavium/liquidio/octeon_droq.c
+++ b/drivers/net/ethernet/cavium/liquidio/octeon_droq.c
@@ -145,6 +145,8 @@ octeon_droq_destroy_ring_buffers(struct octeon_device *oct,
 
 	for (i = 0; i < droq->max_count; i++) {
 		pg_info = &droq->recv_buf_list[i].pg_info;
+		if (!pg_info)
+			continue;
 
 		if (pg_info->dma)
 			lio_unmap_ring(oct->pci_dev,